The government puts a lot of effort into erasing the 1989 massacre from books, TV, and internet resources that are available to its citizens. China's younger generation seems mostly unaware of the student-led, pro-democracy Tiananmen Square protests in Beijing that drove Chinese soldiers to kill hundreds (or possibly thousands) of people.

Some of the words and terms the government has blocked seem odd and out-of-place, but they're tied to the event and could bring up information about it. Some of these words were coded in an (unsuccessful) attempt to evade Chinese government censors.

Here's a list of some of the terms that have been blocked by censors both this year and in the past:

Big yellow duck (because an image circulated online showing giant toy ducks replacing military vehicles in the Tank Man photo, the same photo at the top of this post)

Tank Man (a reference to the above photo of a lone protester trying to block tanks)